Key-pulling device.



C. C. R. HAMMAR.

KEY PULLING DEVICE.

APNIC/111011` FILED JULY 30.1911.

1,273,484. Patented July 23, 1918.

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NITED SAES ATNT OFFCFL.

CHARLES C. R. I'IAMMAR, OF SAN FRANCISCO, CALIFORNIA.

KEY-PULLING DEVICE.

Application led July 30, 1917.

To all whom it may concern Be it known that I, CHARLES C. R. HAM- MAR, acitizen of the United States, residing in the city and county of SanFrancisco, State of California, have invented a new and usefulIKey-Pulling Device, of which the following is a specification in suchfull and clear terms as will enable those skilled in the art toconstruct and use the same.

This invention relates to a key pulling device and its object is toremove headed keys from their secured position upon a rotary shaftinghaving the mounted member thereon.

One of the objects of the invention is to produce a key puller that issimple but effective, the low cost of which will allow for its extensiveuse, the device being standardized in variable sizes.

With these objects in View, the invention comprises various features ofconstruction, as hereinafter set forth in the following description inwhich the same numeral is applied to the same portion throughout;however, I am aware that within the scope of the claims there may beseveral modifications thereof.

Figure 1 is an end elevation of the key pulling device removing a keyfrom an end shafting.

Fig. 2 is a cross section on line 2-2 Fig. 1.

Fig. 3 is a side elevation of the device removing the same type of keyfrom a through shafting.

Numeral 1 indicates an end portion of a rotary shafting, such as forexample a line shafting in a machine shop which has the usual bearingsnot shown, and has secured thereon a mounted member, for example apulley 2, by a headed key 3. Coincident with the key is a keyway 4; forthe end shafting and another keyway 5 is shown for a through shafting,and a keyway in the hub 7. The device consists of a metal block 8 whichmay be cast or drop forged, having a hollow portion 9 for clearing lthehead 10 of the key and an enlarged lip portion 11, which may be plain asshown or may have a knurled surface, for engaging the inner face 12 ofthe key, and a further thinner lip portion 13 is at the opposite end forfitting into a narrower space than in which the portion 11 is shown; insuch an event the jack screws 14: and 15 are reversed. For example thedevice is shown adaptable for keys of one-half to three-quarters of aninch; but it Specification of Letters Patent.

Patented July 23, 1918.

Serial No. 183,645.

is 'to be understfmd that variable size devices may be similarlyconstruetml for larger or smaller keys. Jack screws 1l and 15 are casehardened and have a liberal threaded portion 1G engaging tapped holes 17and are adjustable to bear against the face of the hub 'T of the pulleyor gear that may be in place thereon, as s hown in Fig. 3. The operationis as follows z-By turning the head portion of the jack screws with asuitable wrench, the lip portion 11 draws on the inner face 12 of thekey, as the jack screws 14; and 15 bear against the face of the hub 7,thereby removing the key from the coincident keyways of the shaft andofthe hub 7, the center line of pull being at or near the axis of thejack screws 1&1 and 15. The drawing is assisted by a set screw 1Sthreaded into a semi-circular portion of a yoke 19 having two extendingstraight ends with cap-screws 20 and 2l threaded therein which arefulcrumed in the slotted portions 22 and 23 in the block 8 which allowfor the adjustment of the yoke and set screw 18 for the proper holdingposition on either an end shaft as shown in Figs. 1 and 2, or a throughshafting as shown in Fig. 3. It is to be noted that the lower portion ofthe block 8 is curved concentric with the shaft giving a betterproportion to the device, but it is to be understood that this may bestraight. It is to be further understood that the yoke with its setscrew may or may not be used in connection with the block, and may bedispensed with in the extraction of large headed keys, for example overl the large holding area allowing for a firmer grip than in smaller keyswhere the yoke will materially assist in starting the key, preventing itfrom binding.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent of the United States, is as follows:-

1. A key pulling device comprising a metal block having a hollow portiontherein forming a lip portion integral therewith; said lip portionadaptablefto engage the headed portion of a key securing two lockedmembers; an adjustable yoke having its ends fulerumed onto said metalblock; said block provided with adjustable jack-screws arranged in theside portions thereof; said jack-screws adaptable to bear upon one ofthc locked members; said yoke provided with means to hold the device inits operating positionvduring the operation of the jackscrews for theextraction of the key from its secured position.`

2. AV key pulling device comprising a metal block having end lipportions; a jack screw in tapped holes on each side portion ofsaidblock; either of said end lip portions member on a rotary shafting;adjustable jack screws arranged into the side portions of said blockadaptable for removing said key; a semi-circular yoke having ends Witheaprserevvs therein adaptable to engage s lotted portions in the sidesof said block; a

@epica et this patent Vmay be obtained for ve cent'n each, by addressingthe Commissioner of llateints,Y

of the locked members, lfor the purpose of Y drawing the said lipportion upon the headp ed portion of the key for its extraction.

In testimony whereof I have hereunto set my hand on this 6th day ofJuly, A. D. 1917, in the presence of the two subscribed witnesses.

Vitnesses y W. W. HEALEY, M. E. EWING.V

CHARLES o. Hai/1Min. i

